Metal-bender.



K. M. BOBLETT.

METAL BBNDBR.

APPLICATION FILED DBO. 17. 1912.

Patented Nov. 17, 1914.

6 SHEBTSSHEET l.

Swucwto r K. M. BOBLETT.

METAL BENDER.

APPLICATION mum D130. 17. m2.

Patented Nov. 17, 1914.

6 snzzmsfsmm' z.

, h fi @mmmmmm.

@mmgeb K. M. BOBLETT. METAL BENDER.

V APPLIGATION FILED DEO.17,1912. .1 1 17,77(), Patented Nov. 17, 1914.

6 SHEETS-$131531 3,

J1 1111mm K. M. BOBLETT.

METAL BBNDBR.

APPLICATION FILED DEG.17.1912.

1,11 7,770, Patented Nov. 17, 1914.

5 SHEETS-SHEET 5. I L2 7 7.

mill!HIHHHHHH.

KINDERDIAN 11. BOBLETT, OF TOLEDO, OHIO.

METAL-BENDER.

Specification of Letters Patent.

Patented Nov. 17, 1914.

Application filed December 17, 1912. Serial No. 737,247.

I To all whom. It mcfj; comer-r,

Be it known that i, Krxuuimax M. BOB- nn'rr, a oitizen of the UnitedStates, residing Toledo, in the county of Lucas and Sta-is oi Ohio. haveinvented certain new and useful improvements in Metal-Benders. of whioh"the following is a sporilication.

' mention rela es to metal forming apl and particularly to a metallnrrnling;

machine designed to produce from a single l'lit *heet of inaterial acellular body comly diposed grisinu a succession of oppo..-..;

at v (ill loops or bights.

The object oi. the invention is to provide is a metal bending apparatuswhich Will be simple in structure as Well as in means and mode ofoperation. whereby i. not only may be scononiirally manufaclniul butwill bo more eliirioui' in use. automatic in its open 22' ation. rapidin its production. capable of being: operated by unskilled labor andun-- likely to get out of rppair.

the alum-"o primary and other inciin View as will o I .1 4 v 51 plummore iuily apire-or in tho spevification. the invention (-oufeatures oi(-nilsirliiliioih the parls Comoinations Lherrol and the mode of oplulon or' their equivalents as hrroini ltor dosorilwd and set forth inthe claims.

Referring to the drawings. lhgnro i is a r e ation of a stamp or puzuhpress Elie moi-2d l apparatus has i 2 a si w elevation vi metal bondingapparvo I1 is a plan riou idinE rrn oreil i i plan \io'w (ha ing bradsrafl the 3111 said head; lo

and Iron: the mantlrids being? sidu elevation oi the mandrel.....-'-p..--' Fin 0 pm; Ucui mung; inunaoism l is a (\Lll Viewsomewhat. diagranunalir illustrating snccessive'stsps in theifllillfll'lflll oi the product. Fig. 11 is a detail perspective yiewoi. the die body. Fig. 12 is a perspective \lOW of the product. Fig. 13is a diagram defining the cycle. of operation with relation to therotation of the fly Wheel or main drive shaft. Fig. 14 is a compositediagram of the various steps in the performance of the work. sucressivepositions being shown by solid lines. dotted lines and dot and dashlines respectively.

Like parts are indicated by similar churarters of reference throughoutthe several views.

The bending apparatus forming the subject matter hereof .is designed toproduce from fiat shoot of metal, a cellular body such as is illustratedin Fig. 12 and as fully forth and described in my oo-pending applicationl crial Xo. (387,619 filed April 1, 1912, for improvements in radiators.

The rollular body as shown in Fig. 12 mmprisos a succession ofoppositely disposed lint sided loops or bights or cellular spaces 1-l,the opposite sides of which are indented or recessed intermediate theirends as indicated at 2. such recessed portion being provided with a.longitudinally disposed groove or depression 3.

it will be obvious thatthe apparatus is nus confined to the productionof a body asaotly as shown in Fig. 12, but the recess :1 and depression3 may be omitted from the side oi the loop or bight or other surfaceronlignraiions might be substituted therefor.

Iii-"o loops of (lifibront shapes might be pm- [ii ..\A-

in uho drawings. the invention has been shovvn as applied to a punch orstamp press of ordinary construction which forms no part. or sr. of ihepresent invention. This stamp press comprises a main frame 4 in\Ylll('ll is mounted a 'v'ertirally reciprocating plunger head artuaiodby a drive shaft (i journaied in the upper portion of the main frame l.The drive shaft 6 carries at one end a pulley or fly wheel 7 and at itsopposite end two cranks or wrist pins 8 and 9. Secured upon the bedplate 10 of the stamp press is the basev plate ll of the bendingapparatus. Journaled in pendant bearings l2 projevling from the underside of the base pl ate ll adjacent to one end thereof is a transversehollow rook shaft- 13 carrying two radially disposed arms 14: and 15..lournalod within lhe hollow rock shaft 13 is e secondrock shaft 1 3provided with a radially disposed arm 17. A pitrnan or link 18 connectsthe crank or wrist pin 8 of the drive shaft 6 with the arm 17 of therock shaft- 16. A similar pitman or link 19 connects the crank or Wristpin 9 with the radial arm 14: of the hollow rock shaft 13. Theconnection of the pitmen 18 and 19 with the wrist pins 8 and 9 ispreferably by a double pivotal joint as indicated at 20. This connectionpermits of a more or less universal move ment of the pitman tocompensate for the rotation of the connected parts about axes arrangedat right angles to each other.

Carri d upon the plunger head of the press is a punch 21 co-acting witha die 22 supported upon the base plate 11, (shown in detail in 11). Thedie 22 comprises a. block having an ofi-set or step 23 therein andprovided with lateral flanges he upperplane of the offset block isprovided with a reciprocating plate 95 coincident with the offset orstep 2". The reciprocating plate 25 is provided with laterallyprojecting arms 26 carrying at their outer extremities rollers'27projecting from the lateral faces of the die block 22. These projectingrollers 27 are engaged by can] fingers 28 carried by the plunger head 5and projecting on opposite. sides of the die block 22, to reciprocatethe plate 25 forward beyond the oilset or step 23 against the tension ofits retracting spring 29 as the plunger head and punch move upward. Thisreciprocatory-moven1ent of the plate 25 serves to advance the finishedproduct and section of the material across the die as hereinafterdescribed. The lower plane of the die block is provided intermediate itsside flanges 9'1 with a. aised portion 39, corresponding to thedepression 2 of the product, upon which the finished product issupported.

.lrojecting upward from the surface of the oil-set 0. step 23 andparallel therewih are two ribs or beads 31 corresponding to the grooveddep'e sion 3 of the product which they.cooperate with the punch toproduce as hereinafter mentioned. These beads or ribs 31 produce thegrooved de pression 3 in the under side of the product. whilecorresponding ribs or heads 52 carried upon the punch 21 producesirniiar grooved depressions on the upper side of the product.

Mounted in gibhed ways or guides 33 upon the upper face or". the baseniate 13. are sliding mandrel carrying heads 34. The heads 34reciprocate to and from each other in the guides or ways 33 in adirection at right angles to the path of travel of the material andproduct across the die hloci f 22. The sliding heads 34. terminate attheir 55 adjacent ends in extensions 35 in. which the lower plane of thedie block adjacent togitudinal grooveBf corresponding with the groovedepression 3 of the product and a shoulder 38 adjacent to the support 35corresponding to the raised portion of the product at opposite sides ofthe depression It will he understood that the oppositely disposedmandrels 36 carried by the opposing heads 3% when projected to meet ingpointwithin the cellular spaces 1 will completely fill such spaces. Thelongitudina. grooves 37 in the under side of the man drels 36 registerwith the corresponding rib or head 31 of the die, while those of theupper side register with the head 32 of the punch.

To reciprocate the mandrel heads to and from each other the inandi'els36 to be inserted into and withdrawn from the celiular spaces 1 of theproduct, there is provided upon the base plate 11 beneath the die 22 andintermediate the guides or ways 33 of the sliding heads 3% areciprocating cam plate 40 having converging carn grooves 41 therein.the sliding heads 361 is provided with an inward projecting arm 4:2carrying a roller carrying to cause rocat-ing cam plate 40 with theradial arm 15 of the hollow rock shaft 13. As the drive shaft 6 isrotated, motion is trensmitted through the 'pitinan 19 to the hollowrock shaft 13 causing an oscillatory move znent thereof which movementis transmit-- ted through the radial arm 15 the link or pitman 44 to thecam plate causing areciprocatory movement of the is the cam plate 40reciprocates, the engagement of the rollers 43 within the inclined camgrooves ail causes the mandrei carrying heads 3% to he simultaneouslyreciprocated to or from each other according to the direction ofmovement oi? the plate so. Journaled in uprights forming portions ofeach of themsndre. carrying heads 34 is a rock shaft 45 upon which issecured an elongated gear member 46 having the form of a corrugatedcylinder, the corrugations of which comprise gear teeth. At its innerextremity the rock shaft 45 terminates in an 'oscillstory head 47operating in a plane coincident with the extension and adjacent thereto.A pair o i'mandrels es are carried by each oscillatory head 47. Thesemandrels 48 are counterparts oi the mendrels They are 43 which engagesin one of the cam grooves 4.1. A nnk or pitman 44 connects the recip-Each of separated one from the other by an intermediate spacesubstantially equal to th. thickness of the material operated upon andeach is provided on its outer face with a longitudinal groove 49corresponding to the grooved depression 3 of the product and registeringwith one of the beads or ribs 31 of the die hloclt on the under side andwith the corresponding head or ribs 32 of the punch at the upper side.Each mandrel s8 is also provided upon its outer face with a shoulder 50corresponding With a similar shoulder 38 of the mandrels 36 and withraised portion of the product at either e de of the depression 2. Themandrels l8 are rotated through an arc t 90 degrees from a recumbentposition as shown 111 v to an upright position adjacent to the fixedinandrels 36 as shown in Fig. 8.

The inandrcls a8 are so located in the oscillatory head that theexterior corner 51 of one of the mandrels will coincide with with theaxisof the rock shaft The relation of the parts is such that theoscillation of the shaft 45 and niaudrels carried thereby will notchange the position of the axial corner 51 but the two niandrels 48 willbe turned about said corner line as the center.

To oscillate the .mandrels 4-8 throughout the quarter turn as described,there are pro \ided upon the rocl: shaft 16 adjacent to each endthereof. izear sectors 52. Mounted to side in suit e guides or keepersaru. 5i are rccip'ro "oi-y rack bars engagsec-to 4 .3 at one cxtremitmil the by ical gears it at the opposi tremit The guides are statiuuarilcured upon the Ways or guides 33 in which the mandrel carrying headsAl.- reciprocate. The guides are loosely supported upon the actu; shaft16. The guide or keeper 3-2 heiug; 1 in its position and ri -151mg;

he opposite sides of the raci: oar lateral movement of the latter umudclcarrying head 3i is reci v ated or cylindrical gears it the mandrelcarrying; heads to lie adjusted throughout the full limit oi theirstrokes while maintaining operative engagement Upon the reciprocw u iththe rack lMIS Your mor- Wilt of the manurei carrying heads e 'eeth of:the cylindrical gear it) slide ioug'itudinalljv etiveeu the tor-iii ofthe rack har thereby maintaining at all "L1 opcratire engagement liywhich the ndiu-al gears 46 of the heads 3-; and

i ndrcls -18 may he rotatci'l l the r'ccii'irnwit-or}; movement of therack oars. I h0- lorc stated, the rack liars are reciprncated hi" theaction of the sectors .3? carried upon the rock sha'it'lli which areoscillated or the rotation of the drive shaft 6 transmitted through thepitmau 18 to the radial arm l '4 said rock shaft 1E.

- plungeiu the lillll'i The several Jarts of the operating mechanismbeing; assembled as shown in the drawings and opcratively connected toperform the cycle oi operation in the sequence and at. the timeindicated upon the diagram iu Fig. 1;). the operation of the apparatusis as follows? it is to he noted that the punch is provided with anoil'set or shoulder 56 coi peratiug with the olisct or step of the diel')ll)Cl 2;: and a second offset or shoul- (l"l',- JT upoii u'hirh theribs or heads 39 arc carried coiipeiating with the movable mandrel-s l-Hto form the sheet of metal when the punch is depressed. At the be-;iuninfr oi the opcratiou the punch being in alt-rated position. thesheet of l ateria vxtvuils l'roiu the upper plane of the die hlocl; tothe last iuu-oinpletcd loop or night formed about the uppermost mandrel48 as shoiru in stage l 'ig. ll). the punch descends. the pendantportion thereof intermediate the shoulders Fill and 57 enters betweenthe olisct or step :23 of the die block and the movable manrlrels -i-Scarrying with it a portion of the sheet oi unfornicd metal and forming;therein a sulistantiall rectangular U shaped highi as clearly shown atstage n in Fig. 10. At the same timev the heads or ribs 3; upon thepunch shoulder 3i drive the metal bent over the tops of the iuaiulrclsinto the corrcspomliug longi'i'lgudi ual grooves ill and 53?. At thesame time oll'si-t uortious M at each side of the shoulof the pun hentering: between the )(i a ial i374- il'ar I 1 the outpruiliu in; an

The plunger r ipe-o l'hu'h a disluurc equal to um l m-l1 2.(i 'liii.1istep of the metal is indicated lw dotted lines in stage 7. it. It is tom uaul too-(1 that the inauilrrls il and .lihaw lu'm. entirely\i'itlulrau'n in opposite dircctiims from the wo k m'ior to the slii'l'tiugr iiiorrrucut oi the feed plate Upon Elm initial (lowuu'artlmoveu'icnt of the here: a ti a ers 28 disengage the rollers 2? of thefee 12.3 and r i-iorucate said L all.

mitting the feed plate to be retracted by the action of its spring 29whereupon the mandrel carrying heads 34 are r ciprocated inward towardeach other by the reciprocatory movement of the cam plate 40. However,before being reciprocated inward the oscillating ..-andrels 48 have beenswung downward to a recumbent position such as is shown in Fig, T by thereciprocatory movement of ill. rack bars due to oscillatory movement oishaft 16.

As the mandrel carrying heads move inward, the mandrels 36 enter withinthe superimposed loops cellular spaces last formed while the recumbentmandrels 48 will enter upon opposite sides of the ofiset formed in thesheet of metal as shown at stage 0 Fig. 10. The several mandrels havingbeen reciprooated inward until the manhave entered the worltand meet atthe medial line thereof, the cylindrical gears 1-6 and oscillatingmandrels 48 are rotated through a quarter turn by the reciprocatorymovement of the rack bars 55, oscillating qthe mandrels -18 upon thecorner as an axis. This oscillatory movement of the mandrels l8 carrieswith them the engaged portion of the strip of metal-causing given pointsupon the strip of metal to more through arcuate paths as indicated bydarts --in stage 0, Fig. 10, to corresponding positions with themandrels in upright position, whereby the stripo'f metal will be Wrappedentirely about the lowermost mandrels 48 and about three sides of theupper inandrels l8, assuming the position as shown in stage (2, Fig. 10.its the inandrels 48 are rotated, the longitudinal groove 49 of thelowermost mandrel 18 registers with one of the beads or ribs 31 of thedie block forming on the uncer side of the product the longitudinaldepression 3, while the shoulders 50 of the mandrels 48 coact with thedie block to form the intermediate depressions 2 in the work. 'lhe nextstep in the operation is the descent oi the punch to form a succeedingrectangular U shaped bend in the sheet of metal, thereby completing theloop about the uppermost mandrels l8 and so complet ing the cellularspaces. This cycle of operation is successively repeated until acellular body of the desired length is attained. The second head or rib31 upon the die block insures the proper registration of the work withthe die after each advance step.

From the above description it will be apparent that there has thus beenproduced a machine of the character described, possessing the particularfeatures of advantage bcforeenumerated as desirable, but which ob'iously is susceptible of modification-in its form. proportions, detailconstruction and arrangement of parts Without depart- I 'ing from theprinciple involved or sacrificing any of its advantages.

While, in order to comply with the statute, the invention has beenherein described in language more or less specific as to certainstructural features, it is to be understood that the invention is notlimited to such specific details, but that the means and mechanismherein shown and described. comprise but one mode of putting theinvention into eilect, and the invention is therefore claimed broadly inany of its possible embodiments or modifications within the scope of theappended claims.

Having thus described my invention, I claim y 1. In a bending apparatus,a reciprocatory bending member for forming in a con: tinuous strip ofmaterial a U shaped bight', one side of which is of greater length thanthe other, and an oscillating member for bending the transverse portionof the bight the construction and arrangement being such that theextremity of the short side of the bight will be brought intoproximityto the long side to inclose a cellular space, substantially asspecified.

2. in an apparatus for bending a continuous strip of material into -acellular body, a bifurcated mandrel through the bifurcation of which thematerial to be operated upon extends, means for causing the material atopposite sides of the mandrel to be wrapped in opposite directions aboutsaid bifurcated mandrel and pressure means for setting the material intoconformity with the mandrel.

8. In a bending apparatus, a forming member adapted to form in a stripof ma terial a U shaped bight, and a bending member adapted to bend thetransverse portion of the bight, whereby one side of the bight will bebrought to a position angular with the opposite side of the bight, andmeans for alternately operating the forming member and bending member.

In an apparatus for forming a contin uous strip of material into'acellular body, a movable mandrel and a relatively fixed mandrelto andfrom which the first mentioned mandrel is movable, means for engagingthe relatively fixed mandrel in a previously formed cellular space andto subsequently shift the movable mandrel While engaged with thematerial operated upon to form succeeding cellular space to besubsequently engaged by the relatively fixed mandrel.

5. In an apparatus for forming a continuous strip of material into acellular'body,

amovable head, two mandrels carried thereon in parallel relation andadapted to be moved into and out of engagement with the materialoperated upon by the move ment or" the head, one of the mandrels beingcapable of oscillatory movement to and from the other mandrel, and meansto es- I means to advance the Work upon each rctrograde movement of themandrel.

T. In an apparatus for forming a cellular body, a mandrel capable ofreciprocatory and rotary movement, a punch and die, means to reciprocatethe mandrel to a posi tion. intermediate the'punch and die and tosubsequently rotate the mandrel, substantiallyas described.

8. In an apparatus for forming cellular body, a punch, a die, abifurcated mandrel adapted to engage the strip of material operated uponwithinthe bifurcation thereof, means to rotate the mandrel to bend thestrip into a substantially 8 shape about the fingers of said mandrel,the punch being adapted to pass adjacent to the mandrel and to bend theadjacent portion of the strip to parallelism with the side of themandrel to complete a figure 8 formation of the strip about the fingersof the mandrel, substantially as specified.

9. In an apparatus for forming a cellular body, a punch, tworeciprocatory mandrels one oi the mandrels beingcapable of anoscillatory movement 1n additionto its reciprocatory movement, thenon-oscillatory mandrel being rejected into a previously formed cell byits reciprocatory movement, the oscillatory movement oi the othermandrel being adapted to bend the strip of material about the mandrel toform a succeeding cell, said punch operating to set the metal in bendedform, sulslantially as specified.

10. 1h an apparatus for tinuous strip of material into a co body, areciproc rhy mandrel, a forming member by h the material is pressedinto'contorrnity r. all the mandrel, the continuous strip of materialbeing otilsotbiflthe forming operation, means to reciprocate the mandreland a feeding member engaging the offset in the material to advance theWork upon the withdrawal of the mandrel from engagement therewith.

11. In an apparatus f01 f0l'l'1iliif a con tinuous strip of materialinto a cellular body, a mandrel about which the material forming aconformed, an offset die, a forming member co operating with the mandrelto press the materi l into conformity therewith and coopwith the die tooil-set the material 7 p the next operation, and means for automaticallyadvancing the material and work through a succession of intermittentmovements.

12. in a bending apparatus, a punch, a die, a mandrel cooperating withthe punch and die, rec procatory head upon which the mandrel is carried,a cam, means upon the head engz'lging the cam whereby as the camoperated the hea d will be recipro fated to shift the inaudrel. to andfrom o jierative position, subz-rtantially as speeitie .13. In a bendingapparatus, a punch, adie, a n'ianurel cooperating therewith, areciprocatory head by which the mandrel is carried, a ieciprocatory cammember operating in a path angularly disposed in relation to the path oftravel of the reciprocatorjv' head, said head being engaged with thecan: member whereby a reoiprocatory movement of the cam member willcause a corresponding movement of the head, substantially as specified.

14. In a bending apparatus, a. punch, a die, a mandrel cooperatingtherewith, means to advance the work upon the die through a step by stepmovement, means to reciprocate the mandrel in a direction at rightangleto the movement of the work, said work advancing means and mandrelreciprocating means being actuated alternately, substanti ally asspecified.

.5. In an apparatus for forming a. continuous strip of material into acellular body, a die, a forming member coiiperating therewith to oll'setthe material, a bending member engaging the offset to bend the 1naterialto inclose a cellular space, and means to advance the material from theposition in which it '3 engaged by the forming member positirm to heengaged by the bending member.

16. In a hear ing apparatus, a die, a punch coiiperath therewim to forman ollset in the material operated upon, a reciprocatory "feed memberadapted upon movement to engage the otlset in the material to advancethe Work upon the die, and means to operate the feed member by thewithdrawal of the punch, substantially as specified.

1?. iii; an apparatus for forming a con tinuous strip of material into acellular body, a die, a forming member coliperati'ug therewith tooll'set the material, a bending member engaging the offsetto bend the material to inclose a cellular space and a reciprooatorv feeding memberengaging the ollset o to position to be engaged by the bending member.

the material to advance the material set die, a forming membercooperating with 18. In an apparatus for forming a continuous strip ofmaterial body, means for odsetting the strip of material, a bendingmember adapted to bend the material and a feeding member engaging theoflse to advance'the material to position to be operated upon by thebending member.

19. in a bending apparatus, a forming member adapted to bend thematerial operated upon, oppositely disposed oscillatory mandrels aboutwhich the material is bent, means for reciprocating the oscillatoryinandrels to and from each other, and means for simultaneouslyoscillating the mandrels, substantially as specified.

20. in a metal forming apparatus, an offthe offset die to form an offsetin the strip of material, and a reciprocator'y feedingmember actuated bythe retrograde movement of the forming member to engage the offsetformed in the strip to advance the strip preparatory to thenext'opera'tion.

21. In a bending apparatus, an elongated reciprocatory gear, anoscillatory bending member carried thereby, "a reciprocatory rackmeshing with the gear and adapted by its reciprocatory movement torotate the gear, in relation with which the gear is longitudinallyadjustable While maintaining operative engagement therewith, theconstruction and arrangement being such that the bending member will bemoved into'and out of engagement with the Work by the reoiprocatorymovement otthe gear and will be oscillated While in engagement with theWork by the oscillatory movement of the gear due to the reciprocatorymovement of the rack, $2. In a bending apparatus, an oscillatory mandrelrevoluble about aneccentric axis, means for engaging the mandrel withthe work While positioned at one extremity of its oscillatory movement,means for oscillating the mandrel about its eccentric axis While engagedwith the Work to Wrap the work thereabout, and a forming memberengagingthe Work'at the opposite limit of oscillatory movement of themandrel. to

press the material into conformit mandrel.

23. In a bending apparatus, a bifurcated oscillatory. mandrel thebifurcation or which is ofi'set in relation with the 'aziis ofoscillation, means for engaging the material operated upon in saidbifurcation, means foroscillating the mandrel, and means for pressingthe material into engagement with the mandrel.

2 {in a bending apparatus, an oscillatory mandrel, means for engagingthe mandrel with the work, means for rolling;- the 'mandrel in a linealdirection. a partial reinto a cellularthe ail-"awe press, means foradvancing the work, two

oppositely disposed. reciprocating heads, means for reciprocating theheads to and from each other, an oscillatory mandrel and a fixed mandrelcarried by each of the heads, said fixed mandrels being adapted toproject fron opposite sides of the Work Within a recess previouslyformed in the Work when the heads are caused to approach each other, theoscillating niandrels being adapted to engage the portion of the work tobe operated upon upon the inward reciprocation of the heads, and meansto oscillate the oscillatory mandrels after being engaged 'w'th theWork, said punch press serving to set the portion of the Workbended ythe oscillation of the mandrels, substantially as specified.

26. In a bending apparatus, a bifurcated mandrel, means for causing thematerial to be operated upon to be engaged in the biturcationof themandrel, means for rotat-- 'ing the mandrel to wrap the engagedporscribed, a support for work, having an unalined surfaceconfiguration, over which the material operated upon lies, an oscillatory forming member overlying; the Work having corresponding surfaceconfigure tions registering with those of the Work support when theoscillatory member is at one limit of its oscillatory movement, andmeans to oscillate the forming member to and fro in a lineal directionupon the Work to shape the material to the registering configurations ofthe oscillatory member, and support.

28. In a bending apparatus an oscilla+- tory mandrel, means for engagingthe man drel with the Work and means to roll the mandrel in a linealdirection While engaged it'll the Work to wrap the material thereabout.

29. In a metal forming apparatus, an oscillatory mandrel adapted to beengaged with the material operated upon, means to roll-the mandrel in alineal direction While engaged with the material, a support for thereinconforming to the mandrel.

80. in an apparatus of the character described, a rotary mandrel, and asecond mandrel fined in relation with the rotary mandrel, means forshaping the material around the rotary mandrel, means for engaging anddisengaging said mandrels'wi'th the material the construction andarrange lit the material having sui-ia'ce configurations 1 1 imp fgmtusof the character demczuozy rack, an elongated ri by the racklongitudinally "(m with the rack, :1 man- 'the gem z'eciprocated intogarment with the Work by mcwement of the gear independent 0f the rack,and oscillated by the rotary movement thereof under the influence of therack.

In testimony whereof, I have hereunto set my hand this 9th day ofDecember, 1912. 15

KINDERMAN M. BOBLETT.

Vfimesses B. A. EISCHEN, W. L. Anms.

